Update golangci-lint to v2.6.0 (#35801)

https://github.com/golangci/golangci-lint/releases/tag/v2.6.0

- `modernize` linter is enabled, this is the same as `gopls modernize`
- ~~`perfsprint` linter is disabled because it conflicts with
`modernize` (maybe there is a middle ground)~~
- gocritic `deprecatedComment` is disabled as it conflicts with
`go-swagger`

services/wiki/wiki_path.go

@@ -129,8 +129,8 @@ func GitPathToWebPath(s string) (wp WebPath, err error) {
 func WebPathToUserTitle(s WebPath) (dir, display string) {
 	dir = path.Dir(string(s))
 	display = path.Base(string(s))
-	if strings.HasSuffix(display, ".md") {
-		display = strings.TrimSuffix(display, ".md")
+	if before, ok := strings.CutSuffix(display, ".md"); ok {
+		display = before
 		display, _ = url.PathUnescape(display)
 	}
 	display, _ = unescapeSegment(display)